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Volume XXIII |
Climatology, GIS and Remote Sensing

Mapping desertification susceptibility in the Hodna watershed Algeria, using a remote sensing-based logistic regression approach

1,, 1, 2, 3, 1

Abstract: This study aims to identify regions prone to desertification in the Hodna basin, which covers a vast area of the vulnerable Algerian Steppes. Thirteen factors were selected as independent variables: geomorphological factors (wind and water erosion, Topographic Position Index (TPI), Drainage Density, Slope, Aspect, Elevation), environmental factors (Normalized Difference Vegetation Index (NDVI) and Evapotranspiration), soil factors (Land surface Temperature (LST) and Normalized Difference Salinity Index (NDSI), and socio-economic factors (the Human Influence Index (HII) and the Livestock. Due to the lack of previous desertification data, NDVI anomalies served as the dependent variable. all of the variables were mainly derived using remote sensing techniques and a logistic regression model was applied for analysis in the R environment for desertification susceptibility mapping, displaying stable predictive power with a Receiver Operating Characteristic (ROC) curve of 0.76. Unlike the Northern part of the Mediterranean, where water erosion is predominant, wind erosion and soil salinization emerged as key factors in this study, while the socio-economic factors had less influence than anticipated. The resulting map shows that 45.4% of the basin is highly to very highly susceptible to desertification, provinding essential data for targeted intervention strategies.

Keywords: , , , ,
Full article 10.5775/fg.2024.1.3629Dates:
Received: 08-12-2023 Accepted: 28-06-2024 Printed: 30-07-2024 Online: 07-08-2024
Affiliations:
  • 1 Department of Urban Techniques and Environment, Institute of Urban Techniques Management, University of Constantine 3, Geo-prospective, Environment, and Development Laboratory, Constantine, Algeria
  • 2 Centre de Recherche en Aménagement du Territoire (CRAT), Campus Zouaghi Slimane, Route de Ain el Bey, 25000 Constantine, Algérie
  • 3 Department of Geomorphology, Pedology, Geomatics, Faculty of Geography, University of Bucharest, Bucharest, Romania
Corresponding author:
  • takkieddine.kharchi@univ-constantine3.dz
Author contributions: Conceptualization, T.K.; methodology, T.K., M.C. and M.Y.; formal analysis, C.B., F.G and M.C; investigation, T.K. and M.Y; writing—original draft preparation, T.K.; writing—review and editing, C.B. and F.G and M.C. All authors have read and agreed to the published version of the manuscript.Declaration of interests: The authors declare no conflict of interest.
Citation:
APA 6 | Harvard 2008 | Turabian 6 | MLA 7
RIS | BibTeX
Funding: This research received no external funding.
Copyright: © 2024 The Author(s). Published by Forum geografic.
Provided under the Creative Commons Attribution-NonCommercial-NoDerivatives License.
Open Access article.
Volume XXII |
GIS and Remote Sensing, Hydrology

Flood risk modelling using HEC-RAS and GIS in the semi-urban water-shed of Oued Ziad (Constantine, North-Eastern Algeria)

1,, 2, 3, 4, 5

Abstract: The study of flood risk in Algerian cities has become essential given the multiple issues at stake (urbanization, urban sprawl, easements, infrastructure, soil structure, etc.), which constitute vulnerable elements, as well as their frequen-cy and repetition in time and space. This has become a problem for the city and the urban environment, particularly in large metropolises such as Constantine. The watershed of Oued Ziad located in the northwestern part of the city of Constantine has experienced exceptional flooding, causing loss of life and property in the Jebli Ahmed agglomeration in the Hamma Bouziane township. The main objective of this research is to identify the factors aggravating the risk of flooding in the Oued Ziad watershed, to analyze the frequency of maximum daily rainfall to determine peak flows for different return periods of 10, 20, 50, 100 and 1000 years, and to map the extent of the flood hazard in the Oued Ziad watershed for a centennial flow, using geographic information systems and HecRas software. The simulation results show the overflow of Oued Ziad on national road N°27, affecting a part of the agglomeration located downstream by a centennial peak flow equal to 50. 98 m3/s and a water height exceeding 3 m, which confirms the extent of the area exposed to risk during the flood that occurred on 19/9/2018. The field survey shows that several anthropic factors in-crease the risk of flooding while the capacity of the existing hydraulic structures is insufficient to evacuate water during floods, which requires the development of this watercourse and its banks to protect the population and its property from the risk of flooding and to reduce the impact on the city’s environment and socio-economic activities.

Keywords: , , , , ,
Full article 10.5775/fg.2023.094.iDates:
Received: 03-05-2023 Accepted: 12-06-2023 Printed: 30-06-2023 Online: 27-09-2023
Affiliations:
  • 1 Department of Urban Techniques and Environment, Institute of Urban Techniques Management, University of Constantine3, Constantine, Algeria. Geo-prospective, Environment, and Development Laboratory
  • 2 Territory Planning Research Center, Constantine, Algeria
  • 3 Department of Geomorphology, Pedology, Geomatics, Faculty of Geography, University of Bucharest, Bucharest, Romania
  • 4 Department of Hydraulic Engineering, Faculty of Science and Technology, University of Tlemcen, Tlemcen, Algeria
  • 5 1 Laboratory 60: Water Resources Valorization
Corresponding author:
  • manel.yakhlefoune@univ-constantine3.dz
Author contributions: Conceptualization, M.Y, and A.B; T.E. K, methodology, M.Y, A. B; formal analysis, M.Y; investigation, C.B, M.Y, F, G; writing – original draft preparation, M. Y, writing – review and editing, F. G, C. B, and M. Y. All authors have read and agreed to the published version of the manuscript.Declaration of interests: The authors declare no conflict of interest.
Citation:
APA 6 | Harvard 2008 | Turabian 6 | MLA 7
RIS | BibTeX
Funding: This research received no external funding.
Copyright: © 2023 The Author(s). Published by Forum geografic.
Provided under the Creative Commons Attribution-NonCommercial-NoDerivatives License.
Open Access article.
Volume XX |
Geomorphology

Risk of Dynamics of the River Stream in Tectonic Areas. Case studies: Curvature Carpathian – Romania and Maghrebian Chain – Algeria

1,, 2, 3, 2, 1, 4, 2, 1

Abstract: The tectonic characteristics of the Alpine orogeny highlight some similarities in the genesis of landforms over large areas. This paper analyses the role of tectonic processes in two subsiding areas with uplift movements. The overall tectonic activity implies the formation and evolution of the hydrographic network and its correlation with the major relief structure, thus forming streams parallel to the high-altitude lines, as well as consistent, transversal, and subsequent streams.These tectonic processes are accompanied by antecedents and/or epigenesis common in the Eastern Carpathians, Romania. Hence the Bistrița River is longitudinal compared to the Bistrița and the Stânișoara Mountains, but also transversal in other sectors. In Algeria, the Northeast, especially the Zighoud Youcef zone (NE of Constantine), is characterized by a particular morphography and morphometry of the river basins which reveals reorganizations of the river network through their transversal or longitudinal characteristics compared to the structure and tectonics of the region. In areas with imminent catchments, the regressive erosion amplifies the slope dynamics and slope processes vulnerability.The uplift and subsidence movements impose reorganizations of the hydrographic network of the catchments with the alternation of the erosion and sedimentation processes it creates a certain fluvial style pattern. In the subsidence of the Întorsura Buzăului depression, the longitudinal profile of the Buzău River has a very low slope and its meanders create islets. This is subject to frequent floods which imposed the riverbed regularization. However, in Zighoud Youcef, the Oued Smendou River also indicates some similarities with the Buzău River structure due to subsiding areas of the Mila-Constantine basin.

Keywords: , , , , ,
Full article 10.5775/fg.2021.021.iDates:
Received: 19-12-2020 Accepted: 05-05-2021 Printed: 30-06-2021 Online: 13-09-2021
Affiliations:
  • 1 University of Bucharest, Faculty of Geography, Bucharest, Romania
  • 2 Constantine University 3, Institute of Urban Techniques Management, Constantine, Algeria
  • 3 University of Bucharest, Faculty of Geography/Romanian Young Academy (RYA), Bucharest, Romania
  • 4 University of Oum El Bouaghi, Department of Geology, Constantine, Algeria
Corresponding author:
  • florinagrecu@yahoo.com
Citation:
APA 6 | Harvard 2008 | Turabian 6 | MLA 7
RIS | BibTeX
Copyright: © 2021 The Author(s). Published by Forum geografic.
Provided under the Creative Commons Attribution-NonCommercial-NoDerivatives License.
Open Access article.

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